I'm dealing with this constant breathlessness and I'm not sure if it's from a cold or maybe GERD. I'm having a hard time expanding my chest sometimes, and when I wake up, one of my nostrils is often blocked. Ive had an echo, ECG, TMT, and a chest X-ray done, and all are normal. Every now and then, I take theophylline, which seems to relax things, but I'm still unsure what's actually causing these issues. Could you shed some light on what might be going on?